CVE-2026-47076: Interpretation Conflict vulnerability in benoitc hackney allows Server Side Request Forgery

Routine

MEDIUM 6.5UPGRADE

CVE-2026-47076 is a medium-severity flaw (CVSS 6.5) affecting hackney. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Interpretation Conflict vulnerability in benoitc hackney allows Server Side Request Forgery. hackney_url:normalize/2 URL-decodes the host component after the URL has been parsed into a #hackney_url{} record. OTP's uri_string:parse/1 and inet:parse_address/1 do not decode percent-escapes in the host, so a URL such as http://%31%32%37%2E%30%2E%30%2E%31/ is seen by a caller's allowlist validator with host %31%32%37%2E%30%2E%30%2E%31 (not an IP addre

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-436, CWE-918
Published	2026-05-25
Last modified	2026-07-24

Publisher (CNA): EEF · Vendor: benoitc

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-25 15:16 UTCPublished CVE record published
2026-07-24 10:10 UTCUpdated Record last modified

benoitc hackney UPGRADE

Affected: >= 0.13.0 and < 4.0.1

Fixed in: 4.0.1

Safe to downgrade to: a release before 0.13.0

1. Check installed version

apt-cache policy hackney || rpm -q hackney || hackney --version

2. UPGRADE to 4.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade hackney

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hackney

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.13.0 (Debian / Ubuntu)

apt-cache madison hackney sudo apt install hackney=<VERSION_BEFORE_0.13.0> sudo apt-mark hold hackney

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list hackney sudo dnf downgrade hackney-<VERSION_BEFORE_0.13.0> sudo dnf versionlock add hackney

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47076?

hackney: upgrade to 4.0.1. Exact commands for each OS are on this page.

Is CVE-2026-47076 being exploited?

CVE-2026-47076 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47076 affect?

CVE-2026-47076 affects hackney. Severity is medium (CVSS 6.5). Interpretation Conflict vulnerability in benoitc hackney allows Server Side Request Forgery. hackney_url:normalize/2 URL-decodes the host component after the URL has been parsed into a #hackney_url{} record. OTP's uri_string:parse/1 and ine

How urgent is CVE-2026-47076?

Priority 31/100. Public exploit reference

Related CVEs

CVE-2026-47075 HIGH 7.5 UPGRADE Improper Neutralization of CRLF Sequences vulnerability in benoitc hackney allows HTTP Request Splitting
CVE-2026-47073 HIGH 7.5 UPGRADE Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding
CVE-2026-47066 HIGH 7.5 UPGRADE Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in benoitc hackney allows Excessive Alloc
CVE-2026-47067 HIGH 7.5 UPGRADE Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding
CVE-2026-47071 HIGH 7.5 UPGRADE Uncontrolled Resource Consumption vulnerability in benoitc hackney allows Flooding

References

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