SB20261110260 - Allocation of Resources Without Limits or Throttling in phpseclib

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Main Vulnerability Database SB20261110260

SB20261110260 - Allocation of Resources Without Limits or Throttling in phpseclib

Published: November 10, 2026

Security Bulletin ID SB20261110260
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Allocation of Resources Without Limits or Throttling (CVE-ID: N/A)

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a CPU-exhaustion denial of service and starve PHP workers.

The vulnerability exists due to missing upper bounds on password-based key derivation iteration counts in phpseclib when loading untrusted encrypted PKCS#8 keys, PKCS#12 containers, or CMS password-recipient structures with a password. A remote attacker can supply a crafted file with an ASN.1 iterationCount near PHP_INT_MAX to force excessive hashing before decryption, exhausting worker capacity even when the ciphertext is invalid.


Remediation

Install update from vendor's website.

References