CVE-2026-32935

phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack

HIGH 8.2

At a glance

Source: NVD
EPSS: EPSS 0.39 % · percentile 33 (2026-10-28)
State: PUBLISHED
Published: 2026-03-20 02:48 UTC
Updated: 2026-05-08 15:19 UTC
Assigner: GitHub_M
NVD status: Modified

Description

phpseclib is a PHP secure communications library. Projects using versions 0.1.1 through 1.0.26, 2.0.0 through 2.0.51, and 3.0.0 through 3.0.49 are vulnerable to a to padding oracle timing attack when using AES in CBC mode. This issue has been fixed in versions 1.0.27, 2.0.52 and 3.0.50.

Weaknesses (CWE)

CWE-208 — Observable Timing Discrepancy

References

Scores

Version	Score	Vector	Scored by
CVSS 4.0	HIGH 8.2	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	GitHub_M
CVSS 4.0	HIGH 8.2	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD · security-advisories@github.com (Secondary)
CVSS 3.1	MEDIUM 5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N	NVD · nvd@nist.gov (Primary)

Advisories

GHSA-94g3-g5v7-q4jg — phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack

European references

ENISA EUVD · EUVD-2026-13507
GCVE · GCVE-0-2026-32935

Affected configurations (NVD CPE)

cpe:2.3:a:phpseclib:phpseclib:*:*:*:*:*:*:*:* < 1.0.27
cpe:2.3:a:phpseclib:phpseclib:*:*:*:*:*:*:*:* ≥ 2.0.0 < 2.0.52
cpe:2.3:a:phpseclib:phpseclib:*:*:*:*:*:*:*:* ≥ 3.0.0 < 3.0.50

Affected products

Product	Versions
phpseclib · phpseclib	affected >= 3.0.0, < 3.0.50 ; affected >= 2.0.0, < 2.0.52 ; affected >= 0.1.1, < 1.0.27

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD