01 Record

CVE-2026-115700

SSRF allowlist bypass via percent-encoded bracketed IPv6 or trailing-dot IP literal in hackney

MediumPUBLISHEDCNA: EEF

CNA base score6.9 CVSS v4.0CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

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02 Description

SSRF allowlist bypass via percent-encoded bracketed IPv6 or trailing-dot IP literal in hackney

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 0.13% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 3.1% of scored records. A rank, not a probability.
NVD base score: 6.9 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/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 analysis status: Awaiting Analysis. NVD last modified this record on 2026-10-26.
Red Hat severity: No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-10-26 13:49Z2 DAYS AGO

Last updated

2026-10-26 13:49Z2 DAYS AGO

Reserved

2026-10-25

Assigning CNA

EEF

Record state

PUBLISHED

Severity

Medium (CVSS 6.9)

CNA CVSS vector

CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

Weaknesses

CWE-436Interpretation ConflictClass
CWE-918Server-Side Request Forgery (SSRF)Base

Data version

5.2

Document digest

1953a616ea6e381dd6cfd9add5806b3b6c70ac31ab2e366616202344eb48d98c

05 Affected products

VendorProductVersionsPlatforms

benoitchackney4.0.1 to < 4.9.0, 452620a92ec1da2e6b4862a049a2a4f04b42068f to < f19561a0b422376348c91537e51377ab7325f4ee—

06 References

github.comhackney 4.9.0 release noteshttps://github.com/benoitc/hackney/releases/tag/4.9.0vendor-advisoryrelated
cna.erlef.orgEEF CNA record for CVE-2026-115700https://cna.erlef.org/cves/CVE-2026-115700.htmlrelated
osv.devOSV record EEF-CVE-2026-115700https://osv.dev/vulnerability/EEF-CVE-2026-115700related
github.comRefuse bracketed and trailing-dot IP literals in normalize/2 (benoitc/hackney#987)https://github.com/benoitc/hackney/pull/987related
github.comIntroducing commit 452620a in benoitc/hackneyhttps://github.com/benoitc/hackney/commit/452620a92ec1da2e6b4862a049a2a4f04b42068frelated
github.comFix commit f19561a in benoitc/hackneyhttps://github.com/benoitc/hackney/commit/f19561a0b422376348c91537e51377ab7325f4eepatch