CVE-2025-12084VulnerabilityPublished 9 Feb 2026Updated 8 Oct 2026

SUSE · security update for python3.9

Affects SUSESource GCVE Database

Mentioned vulnerabilities

Authoritative record:CVE-2025-12084· Medium 6.3

Not known to be exploited · CVSS 6.3 Medium · fixed in SUSE package updates : update SUSE when convenient.

Data as of 26 Oct 2026, 09:15 UTC

CVSS 4.0 base score

6.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.7% chance of exploitation in 30 days – higher than 56% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 3.13.11

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
GitHubpython/cpython`pkg:github/python/cpython`Other threats	Affected =0 =3.11.0 =3.12.0 =3.13.0 =3.14.0 =3.15.0	Fixed in–

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AI-suggested

Red Hat has released updated python3 packages that fix this vulnerability. Users of Red Hat Enterprise Linux 7 Extended Lifecycle Support should apply the security update as described in Red Hat advisory RHSA-2026:2713 and the referenced article https://access.redhat.com/articles/11258. No additional mitigation is required beyond applying the official patch.

Description

This update for python313 fixes the following issues: - Update to 3.13.11: - Security - CVE-2025-12084: cpython: Fixed quadratic algorithm in xml.dom.minidom leading to denial of service (bsc#1254997) - CVE-2025-13836: Fixed default Content-Lenght read amount from HTTP response (bsc#1254400) - CVE-2025-13837: Fixed plistlib module denial of service (bsc#1254401) - CVE-2025-8291: Fixed validity of the ZIP64 End of Central Directory (EOCD) not checked by the 'zipfile' module (bsc#1251305) - gh-137836: Add support of the “plaintext” element, RAWTEXT elements “xmp”, “iframe”, “noembed” and “noframes”, and optionally RAWTEXT element “noscript” in html.parser.HTMLParser. - gh-136063: email.message: ensure linear complexity for legacy HTTP parameters parsing. Patch by Bénédikt Tran. - CVE-2025-6075: Fixed performance issues caused by user-controller os.path.expandvars() (bsc#1252974) - Library - gh-140797: Revert changes to the undocumented re.Scanner class. Capturing groups are still allowed for backward compatibility, although using them can lead to incorrect result. They will be forbidden in future Python versions. - gh-142206: The resource tracker in the multiprocessing module now uses the original communication protocol, as in Python 3.14.0 and below, by default. This avoids issues with upgrading Python while it is running. (Note that such ‘in-place’ upgrades are not tested.) The tracker remains compatible with subprocesses that use new protocol (that is, subprocesses using Python 3.13.10, 3.14.1 and 3.15). - Core and Builtins - gh-142218: Fix crash when inserting into a split table dictionary with a non str key that matches an existing key. - Update to 3.13.10: - Tools/Demos - gh-141442: The iOS testbed now correctly handles test arguments that contain spaces. - Tests - gh-140482: Preserve and restore the state of stty echo as part of the test environment. - gh-140082: Update python -m test to set FORCE_COLOR=1 when being run with color enabled so that unittest which is run by it with redirected output will output in color. - gh-136442: Use exitcode 1 instead of 5 if unittest.TestCase.setUpClass() raises an exception - Library - gh-74389: When the stdin being used by a subprocess.Popen instance is closed, this is now ignored in subprocess.Popen.communicate() instead of leaving the class in an inconsistent state. - gh-87512: Fix subprocess.Popen.communicate() timeout handling on Windows when writing large input. Previously, the timeout was ignored during stdin writing, causing the method to block indefinitely if the child process did not consume input quickly. The stdin write is now performed in a background thread, allowing the timeout to be properly enforced. - gh-141473: When subprocess.Popen.communicate() was called with input and a timeout and is called for a second time after a TimeoutExpired exception before the process has died, it should no longer hang. - gh-59000: Fix pdb breakpoint resolution for class methods when the module defining the class is not imported. - gh-141570: Support file-like object raising OSError from fileno() in color detection (_colorize.can_colorize()). This can occur when sys.stdout is redirected. - gh-141659: Fix bad file descriptor errors from _posixsubprocess on AIX. - gh-141497: ipaddress: ensure that the methods IPv4Network.hosts() and IPv6Network.hosts() always return an iterator. - gh-140938: The statistics.stdev() and statistics.pstdev() functions now raise a ValueError when the input contains an infinity or a NaN. - gh-124111: Updated Tcl threading configuration in _tkinter to assume that threads are always available in Tcl 9 and later. - gh-137109: The os.fork and related forking APIs will no longer warn in the common case where Linux or macOS platform APIs return the number of threads in a process and find the answer to be 1 even when a os.register_at_fork() after_in_parent= callback (re)starts a thread. - gh-141314: Fix assertion failure in io.TextIOWrapper.tell() when reading files with standalone carriage return (\r) line endings. - gh-141311: Fix assertion failure in io.BytesIO.readinto() and undefined behavior arising when read position is above capcity in io.BytesIO. - gh-141141: Fix a thread safety issue with base64.b85decode(). Contributed by Benel Tayar. - gh-140911: collections: Ensure that the methods UserString.rindex() and UserString.index() accept collections.UserString instances as the sub argument. - gh-140797: The undocumented re.Scanner class now forbids regular expressions containing capturing

Impact

The vulnerability allows an attacker to cause a denial of service condition by exploiting the quadratic algorithm in xml.dom.minidom, potentially leading to resource exhaustion. This can disrupt availability of services or applications using the affected Python 3 module on Red Hat Enterprise Linux 7 Extended Lifecycle Support systems.

Summary

CVE-2025-12084 is a denial of service vulnerability in the Python 3 cpython implementation caused by a quadratic algorithm in the xml.dom.minidom module. This flaw can be triggered to cause excessive resource consumption leading to denial of service. Red Hat has issued a security advisory (RHSA-2026:2713) providing updated python3 packages for Red Hat Enterprise Linux 7 Extended Lifecycle Support to remediate this issue. The advisory rates the impact as moderate and references the CVE for detailed scoring and acknowledgments.

CWE-770Allocation of Resources Without Limits or Throttling (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #25
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
Requirements
Clearly specify the minimum and maximum expectations for capabilities, and dictate which behaviors are acceptable when resource allocation reaches limits.
Architecture and Design
Limit the amount of resources that are accessible to unprivileged users. Set per-user limits for resources. Allow the system administrator to define these limits. Be careful to avoid CWE-410.
Architecture and Design
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended.
OWASP Cheat Sheets
Abuse Case (opens in a new tab)
OWASP ASVS 4.0.3
V8.1.4 (opens in a new tab)
V13.4.1 (opens in a new tab)
V11.1.4 (opens in a new tab)
Attack patterns
XML Ping of the Death (opens in a new tab)
Exponential Data Expansion (opens in a new tab)
Serialized Data Parameter Blowup (opens in a new tab)
Serialized Data with Nested Payloads (opens in a new tab)
Oversized Serialized Data Payloads (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Jun 2026, 21:56 UTC

WeaknessesCWE-770

Technical details

References

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