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Phpseclib needs guardrails on large binaryfield integers

High severity GitHub Reviewed Published May 5, 2026 in phpseclib/phpseclib

Package

composer phpseclib/phpseclib (Composer)

Affected versions

>= 3.0.0, < 3.0.34

Patched versions

3.0.34

Description

Impact

Anyone loading untrusted ASN1 files (eg. X509 certificates, RSA PKCS8 private or public keys, etc)

Patches

phpseclib/phpseclib@964d781

Workarounds

No.

References

phpseclib/phpseclib@964d781
https://www.usenix.org/system/files/usenixsecurity25-shi-bing.pdf

References

@terrafrost terrafrost published to phpseclib/phpseclib May 5, 2026
Published to the GitHub Advisory Database May 8, 2026
Reviewed May 8, 2026

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(35th percentile)

Weaknesses

Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource. Learn more on MITRE.

Excessive Iteration

The product performs an iteration or loop without sufficiently limiting the number of times that the loop is executed. Learn more on MITRE.

CVE ID

CVE-2023-49316

GHSA ID

GHSA-2f25-pfq3-c7h8

Source code

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