CVE-2026-32935: phpseclib Observable Timing Discrepancy
CVSS: 8.2v4.0HighModified
AliasesUBUNTU-CVE-2026-32935DEBIAN-CVE-2026-32935DSA-6185-1DSA-6186-1DSA-6187-1CGA-38r8-cqmg-pq78CGA-62hp-vx55-676jCGA-r74x-2fr8-w473CGA-v9h3-qwxj-7r5cCGA-f6f6-666q-6w3gCGA-h762-558j-9cr5CGA-ppx9-57gc-pw47CGA-rjpp-cff7-6hj8
Published 20-03-2026Last modified 08-05-2026
Vulnerability summary
CVE-2026-32935 is a high (CVSS 8.2) Observable Timing Discrepancy vulnerability in phpseclib. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 36.7% of scored vulnerabilities.
CVSS score
8.2/10
010
High · v4.0 (CVE.org)EPSS score
0.44%
0%100%
Low · +0.06 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 3 · Related 3Timeline
- 20-03-2026PublishedVulnerability first disclosed.
- 08-05-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
8 scores · 6 sources · 2 versionsHigh 8.2Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:NSourcesAll 5 agree
- OSV · UbuntuEcosystem advisory · calculated8.2HighCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- OSV · WolfiEcosystem advisory · calculated8.2HighCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- OSV · ChainguardEcosystem advisory · calculated8.2HighCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- NVDNIST8.2HighCVSS: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
Medium 5.9Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:NSourcesAll 3 agree
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- NVDNIST5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.44%
Chance of exploitation in the next 30 days
Percentile
37%
Versus all other CVEs
30-day change
+0.06 pp
From 0.37% on 21-09-2026
21-09-202621-10-2026
EPSS score0.44%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Chainguard4 products
- nextcloud-server-30All versions (No fix recorded)
- nextcloud-server-31All versions (No fix recorded)
- nextcloud-server-32< 32.0.8-r2
- nextcloud-server-33< 33.0.3-r0
Debian3 products
- php-phpseclib< 2.0.52-1 | < 2.0.42-1+deb12u3 | < 2.0.48-3+deb13u1
- php-phpseclib3< 3.0.50-1 | < 3.0.19-1+deb12u4 | < 3.0.43-2+deb13u1
- phpseclib< 1.0.20-1+deb12u3 | < 1.0.23-6+deb13u1
Ubuntu3 products
- php-phpseclib< 2.0.1-1ubuntu0.1~esm1 | < 2.0.9-1ubuntu0.1~esm3 | < 2.0.23-2ubuntu0.1~esm3 | < 2.0.36-1ubuntu0.1~esm3 | < 2.0.47-1ubuntu0.1~esm1 | All versions (No fix recorded) | < 2.0.51-1ubuntu0.1~esm1
- php-phpseclib3All versions (No fix recorded)
- phpseclib< 1.0.9-1ubuntu0.1~esm2 | < 1.0.18-2ubuntu0.1~esm2 | < 1.0.20-1+deb12u3build0.22.04.1 | < 1.0.23-1ubuntu0.1~esm1 | All versions (No fix recorded) | < 1.0.24-1ubuntu0.1~esm1
Wolfi2 products
- nextcloud-server-32< 32.0.8-r2
- nextcloud-server-33< 33.0.3-r0
Phpseclib1 product
- phpseclib≥ 0.1.1, < 1.0.27 | < 1.0.27 | ≥ 2.0.0, < 2.0.52 | ≥ 3.0.0, < 3.0.50
5 vendors · 13 products
References
9 links- github.com/phpseclib/phpseclib/security/advisories/GHSA-94g3-g5v7-q4jgX Refsource CONFIRMREPORTAdvisoryPatchVendor Advisory
- github.com/phpseclib/phpseclib/commit/ccc21aef71eb170e9bf819b167e67d1fd9e6e788X Refsource MISCREPORTFIXPatch
