VulnerabilityPublished 31 Oct 2026

CVE-2026-119196: Prowler · pyasn1 has quadratic CPU consumption in constructed BIT STRING decoding

Affects prowlerSource GCVE Database

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Authoritative record:CVE-2026-119196· High 7.5

Not known to be exploited · CVSS 7.5 High : upgrade to 5.47.0 soon.

Data as of 31 Oct 2026, 16:35 UTC

CVSS 3.1 base score

7.5High

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

Thin evidence

One scorer or none

CVSS scores by source
CNA (GitHub_M)	CVSS 3.1	7.5

Patch: Available – fixed in 5.47.0

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 29 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity 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

Upgrade prowler to 5.47.0.

Affected software

Product	Affected	Fixed in
Homebrewprowler`pkg:brew/prowler`Other threats	Affected >=3.4.0 <5.47.0	Fixed in 5.47.0

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AI-suggested

A fix for this vulnerability is available in pyasn1 version 5.47.0. Users should upgrade to version 5.47.0 or later to remediate this issue. No other mitigation is required if the fix is applied. Applications should also consider input validation and limits on ASN.1 fragment counts to reduce exposure, but the primary remediation is upgrading to the fixed version.

Description

CVE-2026-119196 is a high-severity vulnerability in pyasn1 versions from 3.4.0 up to but not including 5.47.0. It causes quadratic CPU consumption when decoding constructed BIT STRING values with many fragments, leading to potential CPU exhaustion and denial of service. The issue affects BER and CER decoders and certain schema-driven DER decoding paths. The vulnerability arises from inefficient bit-shifting operations during decoding. A fix is available in pyasn1 version 5.47.0.

Impact

An attacker who can supply sufficiently large, crafted ASN.1 input to an application using an affected pyasn1 decoder can cause CPU exhaustion during decoding, resulting in denial of service. The vulnerability does not affect confidentiality or integrity. The impact depends on whether the application automatically decodes attacker-controlled ASN.1 data and the input limits enforced by the application. Network exposure and authentication requirements depend on the specific application using pyasn1.

Summary

In pyasn1 through version 0.6.4 (and affected versions up to 5.47.0), decoding a constructed BIT STRING with many fragments causes repeated shifting and copying of the accumulated value, resulting in CPU time growing quadratically with input size. This occurs in both definite-length and indefinite-length fragment loops in the BER and CER decoders, and in the schema-driven DER decoder path that accepts definite-length constructed BIT STRINGs. The vulnerability can be triggered by attacker-controlled ASN.1 data, causing CPU exhaustion during decode() without requiring further processing of the decoded value. The issue is due to the BitStringPayloadDecoder repeatedly calling BitString.fromOctetString, which shifts a growing integer left by fragment bit lengths, making total work O(n²) for n fragments. This can lead to denial of service if untrusted input with enough fragments is decoded.

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Description

AI analysisMachine-generated, updated 31 Oct 2026, 16:35 UTC

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