CVE-2015-0886: Integer overflow in the crypt_raw method in the key-stretching implementation in jBCrypt before 0.4 makes it e

Q: How do I fix CVE-2015-0886?

jbcrypt: upgrade to 0.4; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2015-0886 being exploited?

CVE-2015-0886 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2015-0886 affect?

CVE-2015-0886 affects jbcrypt, fedora. Severity is medium (CVSS 5.0). Integer overflow in the crypt_raw method in the key-stretching implementation in jBCrypt before 0.4 makes it easier for remote attackers to determine cleartext values of password hashes via a brute-force attack against hashes associated wit

Q: How urgent is CVE-2015-0886?

Priority 40/100. EPSS top 8%: very likely to be exploited

This month

MEDIUM 5.0UPGRADEMITIGATE

CVE-2015-0886 is a medium-severity flaw (CVSS 5.0) affecting jbcrypt, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Integer overflow in the crypt_raw method in the key-stretching implementation in jBCrypt before 0.4 makes it easier for remote attackers to determine cleartext values of password hashes via a brute-force attack against hashes associated with the maximum exponent.

Why this priority

EPSS top 8%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	4.8% (top 8%)
CISA exploited list	No
Weakness	CWE-190
Published	2015-02-28
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: fedoraproject · mindrot

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2015-02-28 02:59 UTCPublished CVE record published
2026-06-17 00:21 UTCUpdated Record last modified

mindrot jbcrypt UPGRADE

Affected: < 0.4

Fixed in: 0.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jbcrypt

Note

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

fedoraproject fedora MITIGATE

Affected: 20 · 21 · 22

Fixed in: no fixed release known

Safe to downgrade to: a release before 20

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2015-0886?

jbcrypt: upgrade to 0.4; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-0886 being exploited?

CVE-2015-0886 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-2015-0886 affect?

CVE-2015-0886 affects jbcrypt, fedora. Severity is medium (CVSS 5.0). Integer overflow in the crypt_raw method in the key-stretching implementation in jBCrypt before 0.4 makes it easier for remote attackers to determine cleartext values of password hashes via a brute-force attack against hashes associated wit

How urgent is CVE-2015-0886?

Priority 40/100. EPSS top 8%: very likely to be exploited

References

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