VulnerabilityPublished 1 Oct 2026Updated 29 Oct 2026

CVE-2026-92842: Php · OOB read / info leak in convert.* stream filters when line-break-chars contains NUL

Affects phpSource GCVE Database

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Authoritative record:CVE-2026-92842· Medium 5.9

Not known to be exploited · CVSS 5.9 Medium · fixed in 8.5.11 : update php when convenient.

Data as of 29 Oct 2026, 14:41 UTC

CVSS 3.1 base score

5.9Medium

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 20% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 8.5.11, 8.4.26, 8.3.35 +1

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

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

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: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
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: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Sep 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 29 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 php to 8.5.11, 8.4.26, 8.3.35 or 8.2.34.

Affected software

Product	Affected	Fixed in
Bitnamiphp`pkg:bitnami/php`Other threats	Affected >=8.2.0 <8.2.34 >=8.3.0 <8.3.35 >=8.4.0 <8.4.26 >=8.5.0 <8.5.11	Fixed in 8.2.34 8.3.35 8.4.26 8.5.11

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and has been released in PHP versions 8.2.34, 8.3.35, 8.4.26, and 8.5.11. Users should upgrade to these fixed versions to remediate the vulnerability. No additional mitigation steps are indicated by the vendor advisory.

Description

A vulnerability in PHP stream filters convert.base64-encode, convert.quoted-printable-encode, and convert.quoted-printable-decode allows out-of-bounds read and information leak when the line-break-chars option contains a NUL byte. This occurs because the length of the line-break-chars is tracked separately from the string, and the duplication function stops at the first NUL byte but retains the original length, causing reads beyond the allocated buffer.

Impact

This vulnerability allows an attacker to cause an out-of-bounds read leading to information disclosure of adjacent heap memory. The leaked data could potentially contain sensitive information, depending on the memory layout and usage at runtime. There is no indication of known exploits in the wild.

Summary

The PHP stream filters convert.base64-encode, convert.quoted-printable-encode, and convert.quoted-printable-decode accept a line-break-chars option whose length is tracked independently of the string content. The filter constructors duplicate this option using pestrdup(), which terminates at the first NUL byte, but the original length is kept. Later, when the filter emits a line break, it copies the recorded length from the truncated allocation, resulting in an out-of-bounds read that leaks adjacent heap memory into the filter output. This flaw affects PHP versions >=8.2.0 <8.2.34, >=8.3.0 <8.3.35, >=8.4.0 <8.4.26, and >=8.5.0 <8.5.11 and has been fixed in versions 8.2.34, 8.3.35, 8.4.26, and 8.5.11.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Oct 2026, 13:06 UTC

Technical details

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